12404231221 has 4 divisors (see below), whose sum is σ = 12804367744. Its totient is φ = 12004094700.

The previous prime is 12404231209. The next prime is 12404231249. The reversal of 12404231221 is 12213240421.

12404231221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12404231221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12404231192 and 12404231201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12404231251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200068215 + ... + 200068276.

It is an arithmetic number, because the mean of its divisors is an integer number (3201091936).

Almost surely, 2^12404231221 is an apocalyptic number.

It is an amenable number.

12404231221 is a deficient number, since it is larger than the sum of its proper divisors (400136523).

12404231221 is an equidigital number, since it uses as much as digits as its factorization.

12404231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400136522.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 12404231221 its reverse (12213240421), we get a palindrome (24617471642).

The spelling of 12404231221 in words is "twelve billion, four hundred four million, two hundred thirty-one thousand, two hundred twenty-one".